Art of forming jointure means upon tubular members.



J. CLOSE.

ART OF FORMING JOINTURE MEANS UPON TUBULAR MEMBERS.

' APPLICATION FILED AUG.S. 1 12,

1,098,914. Patented Apr. 21, 19m

FlGl.

till

lit

UNITED STATES PATENT onrron.

JAMES CLOSE, or NEWARK, New JERSEY.

ART OF FORMING JOINTUBE MEANS UPON TUBULAR MEMBERS.

i,oe3,914.

Specification of Letters Patent.

Patented Apr. 21, 1914.

Application filed August 3, 1912. Serial No. 713,066..

To all whom it may concern:

Be it known that I,-JAMns Cross, a c1t1 zen of the United States, residing in the,

city of Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Art of Formand efiicient joint permitting the use .of

stock much lighter in weight than it has hitherto been found possible to use for such purposes: For purposes oiv illustration I have shown a section of tubing such as that used for the frame-work of brass bedsteads and connected thereto the filler rods which are customarily used to form the remainder of the upright frame-work. a 4

In the accompanying drawings which form a part of this'specification, Fi re 1 is, a side elevation of a portion 0 frame-work, parts being broken away to show the application of my improvement; Fig. 2 is a transverse sectional view of a section of tubing'showing the first operation to which it is subjected in making my improved joint; Fig. 3 is a similar view showing a further stage, and Fig. 4C is an enlarged sectional View of a section of sheet tubing and a rodjoined thereto by my novel method.

Referring to'the drawingsin detail, the numeral 1 designates a section of metal or other tubing to which are secured rods 2 and the balls 3 in the manner hereinafter set forth. Hitherto in the construction of tubular metal work such as brass'bedsteads it has been customary to drill a hole radially through the shell of the tube for the reception of rods or other structures which were to be secured theretof The drilled hole was then tapped with a screw thread, and a correspondingly externally threaded rod or the like screwed into the thread thus formed.

While. this practice has been universal, it is extremely wasteful for the reason that it requires the use of a sufiicient thickness of stock to receive a plurality of threads when' such the necessit for stock of sufficient weight to receive t e screw threads has been controllingin the selection of tubing. By reducing this requirement I therefore permit the use of much thinner tubing, which re-.

sults in an article amply strong and more desirable because of the reduction in wei ht.

In making my improved joint, I st punch a hole. radially through the shell of the tube or similar structure with a blunt instrument, which results in the. forcing inward toward the center of the tube of a lip or bur of metal, which finally breaks with a jagged tear.

The numeral 4'designates this lip or bur. A tap is then inserted in the opening thus formed and screw threads 5 out upon the interior of the lip. It will be obvious that by this method the amount of material which is provided for the reception of the threads is greatly in excess of the normal thickness of the 'metal, for instead of the wasteiof metal which normally occurs in drilling a hole in the tube, this metal is conserved and appears as the lip or bur, which is as eflicient to receive the threads as the-body of the tube itself. The edges of this lip or bur extending within the tube willbe agged, but these outstanding ridges I find in practice to be sufficiently stable to- Y withstand the action of the tap and receive the thread.

While I am aware that my invention is particularly adapted for use with circular tubing composed of a more or less ductile material, it is also useful in connection with a tubular member having straight sheet metal sides, a section of which is illustrated in Fig. 4, wherein the sheet 6 carries the lip or bur 7 formed as above described and threaded at 8 for the reception of the externally threaded rod 9 or the like.

vHaving thus described my invention, I claim:

1. The meth'od -.of forming j ointure means upon a tubular member composed of thin material which consists-in piercing the memher from the outside without supporting the adjacent material from the inside, thereby producin a li or bur on the opening thus formed, t 1e axial length of the .Wall of said opening. thus being substantially greater than the original thickness of the material, and then fashioning locking means upon the inner surface of said wall.

2. The method of forming jointure means upon a tubular member composed of thin than .the original thickness of the material, material whichco'nsists inpie'rcing the memand then fashioning a screw thread upon her from the outside without supporting the said wall.

adjacent material from the inside, thereby JAS. CLOSE. 5 producing a lip or bur on the opening so Witnesses:

formed, the axial length of the wall of said H. E. F ERRIS,

opening thus being substantially greater A. L. OIJYER. 

